A tale of Four USB power supplies

No time for commentary here, just pretty pictures of the insides and outputs of some cheap USB wall adapters.

The Contenders

DSC07886

Sirsasana

DSC07887

Full Frontal Nudity

DSC07888

Backsides

DSC07892

Board closeups

(click to zoom)

11b

22b

33b

44b

Signal Output

Here we see how the supply reacts going from open circuit to having a 10 ohm load resistor across it at time “T”.  Gives you a nice view not only of how clean the output is in both cases, but also how it reacts to the sudden increase.

1

2

3

4

…and just for fun, here is an Amazon branded charger that came with my Kindle…

Amazon

…and an Apple adapter….

Apple

Apparently clean and smooth housings produce clean and smooth output! :)

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